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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5453cef2705b3914a2df261d624421dcde1c0fa590d4664c77d280c8be8dae83' 
  AND token = 'dd22e7USLuSzMhCw1+6RbGIowjGtEpv+IX5mRUQ4bh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}